Easy way to download youtube videos.

I found new and snappy way to download youtube videos today.Yeah and easy too.One would happily comment without reading further that extensions and addons are the easiest way to download.yeah they are but what if you are not on your own computer?
so enough of the talking:
1. you are viewing a video on youtube in the address bar there would be for e.g. http://www.youtube.com/watch?v=nCyGpSOCsbs
2. just add keep before the youtube in the url address like  http://www.keepyoutube.com/watch?v=nCyGpSOCsbs
3.hit enter
4. you would be redirected to keep-tube‘s download page for the video you were viewing
And all you need is to allow the java applet to run